Loose-joint drill collar



Dec. 7 1926.

L. L. WILSON LOOSE JOINT DRILL COLLAR Filed March 9, 1926 W, Wl a Z M W M a@ 0 7% mw 2 j m /L M -HIMMMINNMWL .MHH HHNHHNNIMU MHV. 2 H

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Patented Dec. 7, 19126.v

uTTeo sTATss LEONARD LUTHER WILSON, F TONKAWA, OKLAHOMA.

LOOSE-JOINT DRILL COLLAR.,

Application tiled March 9, 1926. Serial No. 93,459.

o .The present inventionrelates toA a loose )oint drill collar for use in rotary drills. 'lhe ordinary cable drilling tools include a heavy bit suspended on a steel cable which.

o is lifted up and down repeatedly until the hole is drilled to the desired depth. The ordinary` rotary drill includes a heavy steel bit suspended from steel drilling pipes, all of which is rotated until the holel is drilled 1G to the desired depth. l propose to provide an exceedingly compact and convenient device whereby it is possible to combine the driving power oi the cable tool and the revolving character of the rotary tool.

ll` further contemplate the provision of a device or" this nature which is simple in 'its construction, easy to assemble and disassemble, strong, durable, elhcient and reliable in operation, and otherwise well adapted to the purpose for which it is designed.

With the above and numerous other objects in view as will appear as the description proceeds, the invention resides in certain novel features ot construction, and in the combination and arrangement of lparts as will be hereinafter more fully described and claimedn l ln the drawingslligure 1 is a longitudinal section through a drilling apparatus embodying the ieatures my invention,

lligure 1a is a continuation ot Figure 1, an

Figure Q is a transverse cross section taken substantially on the line 2 2 ot Figure 1a.

Referring to the drawing in detail it will be seen that the numeral 5 designates the hollow rod which aids in imparting rotary motion to the bit, not shown, in the usual well irnown manner., rthe rod is hollow lor the purpose or" eeding water to the bit so as to Iorni mud immediately ahead ot the bit. ris rodi 5 is rotatable through the usual I shell sections 6 and The shell indicated hij; generally' bythe letter A has its upper portion 3 threadedly engaged with the vsection 1? as S, is provided with the oil chamber The rod 5 extends through this oil chamber and has washers disposed thereover the chamber; springs i3 are disposed about the rod 5 within the chamber 10 between the washers l2, The intermediate portion la ot the shell is provided with a hexagonal bore 'for slidably receiving a hexagonal rod section l5 which is threadedly engaged with the lower end of rod 5. This rod section is also hollow so that the water may pass therethrough. yThe lower end of the shell A is indicated by the numeral 17, and receives the head 18 formed on` the lower `end of the rod section 15. Suitable. packing and stop means 19 are disposed in the end 17 for limiting the movement of the head 18 as is quite apparent from the drawing. i t

An extension 20 is slidablet-hrough the stuffin box 19 and a joint 21 of well known form-a ion is attached thereto 'for engagement with the bitA (not shown) in the well known manner.

From the above description it will be seen that the rod 5 Will rotate with the shell but is capable of sliding movement in relation thereto. Rotary motion is imparted to the rod5 in the usual well known'manner, and the weight of the shell causes the compression ot springs 13 as is quite apparent, thereby giving the desirable driving power to the bit.

I consider that this loose joint drill collar is an improvement over the simple rotary drill which is in itself an improvement upon the cable tools. The improvement consists irst in drilling and second in iishing.

Often when a hole has been started, the bit must be hauled up and removed, and a fresh bit put in operation. 'The new bit seldom, if ever, is of the same precise measurement as the one just removed. lt the bit is slightly larger and is dropped down in the hole, the driller has a` bit jammed or stuck in the hole and with irorn titty to three thousand feet or pipe Jfrom which it is suspended and requires several days, oftentimes, to loosen the bit in the hole, whereas with my improvement including the spring arrangement it will permit a play of nearly three toet, which will rnalre the loosening ot the-bit much easier and more rapid.

'When a tool is lost in hole, it is seldom, it ever, lett standing in a perpendicular position, but is much more lilielyjto be leit slightly tipped. With t e simple rotary tool, there is anywhere trom titty to three thousand 'feet oi drill pipe with the appropriate weight ydropped down to' the tool, so that the chances are greater that the lost tool may be driven Jfurther out pt a perpendicular position so that the cshing tool will not slip overl the top ot the lost tool and grab it. ln the present device, however, the

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tool can be lowered simply to contact, or a little further than actual contact, and thendicular.

It is thou ht that the construction, operation, and a vantages of this invention will be clearly understood by those skilled in this art Without a more detailed description thereof. j

The present embodiment of the invention has been disclosed in detail merely b v way of example since in actual practice it has attained the features of advantage enumerated as desirable in the statement of the invention and the above description.

It is apparent that numerous changes in the details ofconstruction, and in the combination and arrangement of parts may be resorted to without departing from the spirit or scope of the invention as hereinafter claimed or sacrificing any of its advan- V ta es.

-Iaving thus described the invention, what I claim as new and desire to secure by Letters Patent is In a well drill', a plurality of shell sections, a special shell section attached to one of the first shell sections and forming a hull, said hull including an upper portion having a bore, an intermediate portion having a non-circular bore, and a lower endl having a bore, rod sections removable through the shell sections, one of said rod sections being disposed in `the non-circular bore and being non-circular in conformity therewith to prevent rotation independently of the special shell section, a spring structure including washers disposed about thel other rod section in .the upper end of the special shell section, and springs disposed between vthe washers so that -said spring structure impinges against one of the first mentioned shell sections at its upper end, and against the non-circular rod section, at lits lower end, for supporting the shelly sections on the rod sections.

In testimony whereof I aiix my signature.

. LEONARD LUTHER WILSON. 

